High-k composites with sandwich structure by introducing a negative permittivity layer with Ni as conductive filler. Issue 16 (November 2019)

• Record Type: Journal Article
• Authors: Wang, Zhuo; Fan, Jiahao; Li, Yinbo; Wang, Xiaoying; Chen, Haonan
• Is Part Of: Ceramics international. Volume 45:Issue 16(2019)
• Page Start: 20128
• Page End: 20132
• Publication Date: 2019-11
• Subjects: Dielectric -- Negative dielectric constant -- Polymer matrix -- Low loss tangent; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.06.278
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Advanced electronic equipment requires new high dielectric constant materials. Nevertheless, the balance of the permittivity and dielectric loss remained a problem. In this work, BFT/PVDF-Ni/PVDF sandwich polymer matrix composites (SPMCs) containing alternating negative dielectric constant and positive dielectric constant layers were fabricated using hot press sintering. The structure and dielectric properties of the composites were investigated. The results indicated that introducing negative dielectric constant layer into SPMCs led to higher dielectric constant (ε′ ≈ 130) and low loss tangent (tanδ ≈ 0.14) at 1 kHz compared with the pristine PVDF (ε′ ≈ 10, tanδ ≈ 0.020). The effective increase of dielectric constant was due primarily to the introduction of a negative dielectric layer into the material. The low loss tangent was caused by the ohm barrier effect between adjacent layers.